For the fourth installment of the BBC crime series Prime Suspect, the producers experimented with the shows format. Instead of following police detective Jane Tennison (Helen Mirren) through a single murder investigation over the course of four hours, Prime Suspect 4 includes three 90-minute, stand-alone mysteries. In The Lost Child, Tennison investigates the disappearance of a child whose mother is unwittingly dating a convicted sex offender. In Inner Circles, she traces the connection between the residents of a brutal housing development and the well-heeled denizens of an exclusive country club whose manager is brutally murdered. And The Scent of Darkness returns to the serial-killer investigation that made Tennisons career (in Prime Suspect 1) as additional murders with the same modus operandi bring up the possibility that she apprehended the wrong man. In addition to its new format, Prime Suspect 4 also depicts, in The Lost Child, the first non-murder investigation of Tennisons career. Prime Suspect 4 originally aired April 30, May 7, and May 15, 1995, in the United Kingdom. ~ Brian J. Dillard, All Movie Guide